lucene Hello World

一个lucene创建索引和查找索引的样例：

创建索引:

public class Indexer {
private  IndexWriter indexWriter;
/**
 * 构造器实例化indexWriter
 * @throws Exception 
 */
public Indexer(String indexPath) throws Exception {
Directory directory = FSDirectory.open(Paths.get(indexPath));//索引存储的位置
Analyzer analyzer = new StandardAnalyzer();//标准分析器
IndexWriterConfig iwc = new IndexWriterConfig(analyzer);
indexWriter = new IndexWriter(directory, iwc);
}
/**
 * 关闭indexWriter
 * @param indexWriter
 * @throws IOException 
 */
public void close() throws Exception {
indexWriter.close();
}
/**
 * 获取文档Document
 * @throws FileNotFoundException 
 */
public Document getDocumnet(File f) throws Exception {
Document doc = new Document();
doc.add(new TextField("content", new FileReader(f)));
doc.add(new TextField("tittle",f.getName(),Field.Store.YES));
doc.add(new TextField("path",f.getCanonicalPath(), Field.Store.YES));
return doc;
}
/**
 * 索引当个文件
 * @throws Exception 
 */
public void indexFile(File f) throws Exception {
System.out.println(f.getName());
Document doc = this.getDocumnet(f);
indexWriter.addDocument(doc);
}
/**
 * 索引一个目录下的所有文件
 * @param filePath 目录路径
 * @return 索引文件的个数
 * @throws Exception 
 */
public int index(String filePath) throws Exception {
File[] files = new File(filePath).listFiles();
for(File f:files) {
this.indexFile(f);
}
return indexWriter.numDocs();
}
public static void main(String[] args) {
        String indexPath = "G:\\工作\\luence\\index";
        String dataPath = "G:\\工作\\luence\\data";
        Indexer indexer = null;
        int indexNum=0;
        try {
            indexer = new Indexer(indexPath);
            indexNum = indexer.index(dataPath);
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                indexer.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        System.out.println("索引了"+indexNum+"个文件");
    }
}

查找索引:

public class Searcher {
public static void search(String indexPath,String searchStr) throws Exception {
 
Directory dir = FSDirectory.open(Paths.get(indexPath));
IndexReader indeReader = DirectoryReader.open(dir);
IndexSearcher indexSearch = new IndexSearcher(indeReader);
 
Analyzer analyzer = new StandardAnalyzer();//标准分词器
QueryParser parser = new QueryParser("content", analyzer);
Query query = parser.parse(searchStr);
TopDocs td = indexSearch.search(query, 10);
for(ScoreDoc sc:td.scoreDocs) {
Document doc = indexSearch.doc(sc.doc);
System.out.println(doc.get("tittle"));
System.out.println(doc.get("path"));
}
}
public static void main(String[] args) throws Exception {
Searcher.search("G:\\工作\\luence\\index\\", "Hollywood");
}
}